A good, stable app that gives the non-premium member decent access to the basho. It’s about on par with the Japan Sumo Association website, but not significantly better. Premium membership is ridiculously overpriced, and I’m an avid sumo fan who watches every day of the top three divisions¡ bouts, but I’m still not paying nearly the price they want! That being said, there are significant limitations to GrandSumoOfficialApp (I can only search for one heya's rikishi, unless I cancel my favorite and make another my favorite. The search function only allows you to search for rikishi, not heyas, so that’s limited also. But it does give up to the minute results if every bout, and you can watch one video a day, keep track of each day's matches, and each rikishi's record (though there is no leaderboard on any level).